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Matamaitic » Loighic & Tacartheoiric Deirtear go bhfuil dhá fhoirmle r agus s coibhéiseach más gá agus más leor luach fírinne r a bheith cothrom le luach fírinne s do gach aon rogha de thairiscintí a chuirtear in ionad a n-athróg faoi seach.
Mathematics » Logic & Set Theory Two formulae r and s are called equivalent if and only if the truth value of r is equal to the truth value of s for each choice of propositions which are substituted for their respective variables.